. Monographs of North American rodentia [microform]. Rodentia; Paleontology; Rongeurs; Paléontologie. 798 MONOORAPITS OF NORTH AMERICAN RODENTIA. localitios, as well as with the detailed descriptions giren by authors of the Old World form. P'iXamples from Fort Resolution, Fort Rae, Fort Liard. Fort Simpson, and Nelson's and Mackenzie Rivers are much paler than those from the region more to the southward, with less rufous edging to the black stripes of the back (many of them being quite without such edging, just us in Siberian examples) and less rufous on the sides of the body. Specimens taken
. Monographs of North American rodentia [microform]. Rodentia; Paleontology; Rongeurs; Paléontologie. 798 MONOORAPITS OF NORTH AMERICAN RODENTIA. localitios, as well as with the detailed descriptions giren by authors of the Old World form. P'iXamples from Fort Resolution, Fort Rae, Fort Liard. Fort Simpson, and Nelson's and Mackenzie Rivers are much paler than those from the region more to the southward, with less rufous edging to the black stripes of the back (many of them being quite without such edging, just us in Siberian examples) and less rufous on the sides of the body. Specimens taken along the forty-ninth parallel are intermediate between tliose from the far north and the bright richly-colored phase commonly met with in the mountains of Colorado. Many of the specimens from the Black Hills of Montana are equally rich in color with those from Colorado, being, in most cases, absolutely indistinguishable. Others of like tint come from the Uintah and Sierra Nevada Mountains In the Coloradan or quadrivittatus form, the rufons of the sides assumes a peculiarly rich, lively tint of rust, the light dorsal stripes pre whiter, and the dark ones are more intensely black and more narrowly edged with rufous. A much paler form is met with on the plains east of the Rocky Mountains, wherever the species is represented, becoming palest in the Mauvaises Terres region, where it also decreases very much in size. The form met with in the Rocky Mountain ranges north of the South Pass is larger, and has the rufous parts of a duller brown than is seen in the form which prevails in the mountains more to the southward. In the Bitter Root and Cascade ranges, the size still further increases, and the colors become still duller and heavier, jmssing here into the very ' .rge anu peculiarly dark form of the coast region of Washington Territory and British Columbia. In this phase, the rufous tint of the sides no longer brightly contrasts with the general color of the dorsal surface, which
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Keywords: ., bookcentury1800, bookdecade1870, bookpub, booksubjectpaleontology
